В man pwconv(8), 7ой абзац:
pwconv will use the values of fBPASS_MIN_DAYS, PASS_MAX_DAYS, and
PASS_WARN_AGE from fI/etc/login.defs when adding new entries to /etc/shadow.
s|fBPASS_MIN_DAYS|\fBPASS_MIN_DAYS|
s|fI/etc/login.defs|\fI/etc/login.defs\fR|